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Software

open62541 (OPC UA)

By open62541 project, Germany (checked on github.com/open62541 (opens in a new tab)), from github.com/open62541/open62541 (opens in a new tab)

  • Robot arms and industry
  • Library
  • MPL-2.0

open62541 is a C implementation of the OPC UA standard (IEC 62541) for building OPC UA clients and servers, or adding OPC UA communication to existing applications.

Open on GitHub (opens in a new tab)

Facts

GitHub stars
3,271read on 6 Nov 2026
Last update
6 Nov 2026Newest commit on master
Maintenance
Activea commit in the last 90 days
Difficulty
Advanced

Checked on GitHub on 6 Nov 2026.

Licenses

Code
MPL-2.0 (opens in a new tab)

Read by Robotheca from LICENSE (opens in a new tab) (MPL-2.0) and LICENSE-CC0 (opens in a new tab) at commit 8f169f1 (opens in a new tab), on 6 Nov 2026. A license text Robotheca's reader does not know: a person at Robotheca set it on 9 Nov 2026.

Commercial use
Yes

Overview

What it does: Robotheca's summary

  • Platform independent: platform-specific functions are provided through exchangeable plugins, easing ports to embedded targets.
  • Core library depends only on the C99 standard headers; it can be built against the C standard library alone on most systems.
  • Can be built with CMake or used as a single-file distribution (open62541.c/.h) added directly to a project.
  • Supports building OPC UA servers that expose information model nodes and clients that read values from them.
  • Optional encryption depends on libraries such as mbedTLS or OpenSSL, chosen by the build configuration.
  • Some code is generated from the OPC UA XML definitions by Python scripts run during the build.

Written by Robotheca from the project's README (opens in a new tab) at commit 3a962e7, not by its creator.

The README

Read the README on GitHub (opens in a new tab)

Files and versions

Facts read at commit 8f169f1

Robotheca read the repository at two versions: the summary at 3a962e7 and the facts at 8f169f1 (read on 6 Nov 2026).

Robotheca never hosts the code: each link goes to the creator's own page.

Use it

How to install it, in the creator's words: The project's website (opens in a new tab)

Robotheca doesn't review code. Read it before running it.

Robotheca lists software as a reference: nothing is hosted or run here, and every fact links to where it was read.